Question

29.What is the surface area of the cone?90 cm²1207 cm²12 cm5 cm

Answer 1

Given:

The cone with height(h) 12 cm and radius(r) 5 cm.

Required:

What is the surface area of the cone?

Step-by-step explanation:

The formula required to calculate surface area of cone:

`\begin{gathered} SA=\pi r(r+√(h^2+r^2)) \\ Where, \\ r(Radius) \\ h(Height) \end{gathered}`

We have radius(r) = 5 cm and height(h) = 12 cm.

So,

`\begin{gathered} SA=\pi*5*(5+√(12^2+5^2)) \\ SA=\pi*5*(5+√(169)) \\ SA=\pi*5*(5+13) \\ SA=\pi*5*18 \\ SA=90\pi cm^2 \end{gathered}`